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6.2. Equilibrium - II (icon Equilibrium) — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry6.2. Equilibrium - II (icon Equilibrium)1 Mark
MCQ
The solubility of $Ca ( OH )_{2}$ in water is ....... .

[Given : The solubility product of $Ca ( OH )_{2}$ in water $\left.=5.5 \times 10^{-6}\right]$

  • A
    $1.77 \times 10^{-6}$
  • B
    $1.11 \times 10^{-6}$
  • ✓
    $1.11 \times 10^{-2}$
  • D
    $1.77 \times 10^{-2}$
✓

Answer

Correct option: C.
$1.11 \times 10^{-2}$
c
$Ca ( OH )_{2} \rightleftharpoons Ca ^{2+}( aq )+2 OH ^{-}( aq )$

$\quad \quad \quad \quad \quad \quad \quad \quad s\quad \quad \quad \quad \quad 2s$

$k _{ sp }= s (2 s )^{2} \Rightarrow 5.5 \times 10^{-6}=4 s ^{3}$

$\Rightarrow s =\left(\frac{5.5}{4}\right)^{\frac{1}{3}} \times 10^{-2}=1.11 \times 10^{-2}$

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